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  <div class="section" id="fix-property-atom-tracer-stream-command">
<span id="index-0"></span><h1>fix property/atom/tracer/stream command<a class="headerlink" href="#fix-property-atom-tracer-stream-command" title="Permalink to this headline">¶</a></h1>
<div class="section" id="syntax">
<h2>Syntax<a class="headerlink" href="#syntax" title="Permalink to this headline">¶</a></h2>
<div class="highlight-python"><div class="highlight"><pre>fix id group property/atom/tracer/stream mark_step s n_tracer n insert_stream ins-ID every e
</pre></div>
</div>
<ul class="simple">
<li>ID, group-ID are documented in <a class="reference internal" href="fix.html"><em>fix</em></a> command</li>
<li>property/atom/tracer/stream = style name of this fix command</li>
<li>mark_step = obligatory keyword</li>
<li>s = step when atoms are marked (or started to be marked, depending on marker_style)</li>
<li>n_tracer = obligatory keyword</li>
<li>n = number of tracer atoms to be marked</li>
<li>insert_stream = obligatory keyword</li>
<li>ins-ID = ID of a <a class="reference internal" href="fix_insert_stream.html"><em>fix insert/stream</em></a></li>
<li>every = obligatory keyword</li>
</ul>
<div class="highlight-python"><div class="highlight"><pre><span class="n">e</span> <span class="o">=</span> <span class="s1">&#39;once&#39;</span> <span class="ow">or</span> <span class="n">integer</span> <span class="o">&gt;</span> <span class="mi">0</span>
</pre></div>
</div>
</div>
<div class="section" id="examples">
<h2>Examples<a class="headerlink" href="#examples" title="Permalink to this headline">¶</a></h2>
<div class="highlight-python"><div class="highlight"><pre>fix tracer all property/atom/tracer/stream mark_step 10000  insert_stream ins  n_tracer 20  every 10000
</pre></div>
</div>
</div>
<div class="section" id="description">
<h2>Description<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
<p>Fix property/atom/tracer/stream marks a given number of particles (as defined
by keyword <em>n_tracer</em>) which are generated by a <a class="reference internal" href="fix_insert_stream.html"><em>fix insert/stream</em></a>
command (as defined by keyword <em>ins-ID</em>. The first <em>n_tracer</em> particles which pass
the insertion face after time-step <em>mark_step</em> are being marked as tracers.
In case of <strong>every</strong> = once, this procedure is performed once, otherwise
the procedure is repeated for the first <em>n_tracer</em> particles which pass
the insertion face after step <em>mark_step</em> + <em>every</em>.</p>
<p>Note that even for option <em>once</em>, particles are the marking procedure can
extend over multiple packets of insertion by a <a class="reference internal" href="fix_insert_stream.html"><em>fix insert/stream</em></a>
in case that the number of particles inserted in a packet is smaller than the number
of particles to tag (as defined by keyword <em>n_tracer</em>).</p>
<p>An arbitrary number of <a class="reference internal" href=""><em>fix property/atom/tracer/stream</em></a>
commands can be used for a given <a class="reference internal" href="fix_insert_stream.html"><em>fix insert/stream</em></a>.</p>
<p>It is useful to combine this command with a
<a class="reference internal" href="compute_nparticles_tracer_region.html"><em>compute nparticles/tracer/region</em></a>
command to compute residence time distributions.</p>
<div class="admonition warning">
<p class="first admonition-title">Warning</p>
<p class="last">Due to some parallel operation which needed to tag the particles, you need an
atom map to be allocated, see the <a class="reference internal" href="atom_modify.html"><em>atom_modify</em></a> command for details.</p>
</div>
</div>
<div class="section" id="restart-fix-modify-output-run-start-stop-minimize-info">
<h2>Restart, fix_modify, output, run start/stop, minimize info<a class="headerlink" href="#restart-fix-modify-output-run-start-stop-minimize-info" title="Permalink to this headline">¶</a></h2>
<p>Information about this fix is written to <a class="reference internal" href="restart.html"><em>binary restart files</em></a> .</p>
<p>This fix computes a per-atom vector (the marker) which can be accessed by
various <a class="reference internal" href="Section_howto.html#howto-8"><span>output commands</span></a>. .
This fix also computes a global scalar indicating how many particles were
marked since the last time the global scalar was computed. This scalar
can also be accessed by various <a class="reference internal" href="Section_howto.html#howto-8"><span>output commands</span></a>. .</p>
</div>
<div class="section" id="restrictions">
<h2>Restrictions<a class="headerlink" href="#restrictions" title="Permalink to this headline">¶</a></h2>
<p>Currently, this feature does not support multi-sphere particles.</p>
</div>
<div class="section" id="related-commands">
<h2>Related commands<a class="headerlink" href="#related-commands" title="Permalink to this headline">¶</a></h2>
<p><a class="reference internal" href="compute_nparticles_tracer_region.html"><em>compute nparticles/tracer/region</em></a></p>
<p><strong>Default:</strong> none</p>
</div>
</div>


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